2.16 Details on Protocols
Extended MEMOBUS Protocol
2-398
Error Responses
Major Function Code of 20 Hex
The following message is returned.
• The sub function code in the command message is illegal.
• The reference address is illegal.
• The number of data items is incorrect.
7•••••••••0
(L)
(H)
Command
Length
MFC: 20 hex
SFC: 01 to 33 hex
CPU number
Message body
7•••••••••0
(L)
(H)
Response
Length: 04 hex
MFC: 20 hex
SFC: SFC + 80 hex
CPU number
Error code
Error code
01: SFC error
02: Reference address error
03: Number of data items error
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